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void main() and int main()
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is there any advantage in using int main() over void main()?.
and when you return a value in int main(), where does the returned value go?
and when you return a value in int main(), where does the returned value go?
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> is there any advantage in using int main() over void main()?.
-- Stroustrup
> when you return a value in int main(), where does the returned value go?
-- Stroustrup
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The definitionvoid main() { /* ... */ }is not and never has been C++, nor has it even been C. See the ISO C++ standard 3.6.1[2] or the ISO C standard 5.1.2.2.1. A conforming implementation accepts
int main() { /* ... */ }and
int main(int argc, char* argv[]) { /* ... */ }A conforming implementation may provide more versions of main(), but they must all have return type int.
> when you return a value in int main(), where does the returned value go?
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The int returned by main() is a way for a program to return a value to "the system" that invokes it. On systems that doesn't provide such a facility the return value is ignored, but that doesn't make "void main()" legal C++ or legal C. Even if your compiler accepts "void main()" avoid it, or risk being considered ignorant by C and C++ programmers.
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Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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Is the advice different for devices that do not necessarily have an operating system.
Like embedded devices though?
Like embedded devices though?
*Voted best profile in the world*
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Originally Posted by iamthwee 
Is the advice different for devices that do not necessarily have an operating system.
Like embedded devices though?
Last edited by Ancient Dragon; Feb 16th, 2008 at 10:00 am.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
>Is the advice different for devices that do not necessarily have an operating system.
Freestanding implementations are excepted from a lot of the rules of hosted implementations. But since a programmer on a freestanding implementation is highly unlikely to be asking this question, and int main is always correct, the advice stands.
Freestanding implementations are excepted from a lot of the rules of hosted implementations. But since a programmer on a freestanding implementation is highly unlikely to be asking this question, and int main is always correct, the advice stands.
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